I am looking at purchasing a 300dpi image off Getty images for an interior wall print in my office. It says the file is 11x17 (5184x3456 px) 300 dpi. I am wondering how large I will be able to take this file and print. I would like to be able to print in the 30x40 or 40x60 range.

I have personally used my 4mb Nikon D80 jpeg's to print out 40x60 prints and they come out looking great.

I would like to make sure these files are indeed going to work or not since they are quite expensive and I don't have a way to test or try before purchasing.